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软土条件下,应力各向异性对复杂状态下土体的变形规律有重要影响。卸载状态下的K0固结土体具有其特有的强度和变形特性。本文建立了一个简单、便于工程使用且能够描述土体各向异性的理想弹塑性本构模型,并将该本构模型耦合到ANSYS软件中,模拟分析了各向异性对基坑开挖变形的影响。结果表明:各向异性对土体的变形性状有重要影响,且对土体的水平变形和与竖向变形的影响程度与开挖宽度和开挖深度的比值有关。
Under soft soil conditions, the stress anisotropy has an important influence on the deformation of soil under complicated conditions. Unloading state of K0 consolidated soil has its own unique strength and deformation characteristics. In this paper, an ideal elastic-plastic constitutive model that is simple to use and able to describe the anisotropy of soil is established. The finite element model is coupled with ANSYS software to simulate and analyze the effect of anisotropy on the deformation of excavation influences. The results show that the anisotropy has an important influence on the deformation of soil, and the relationship between horizontal deformation and vertical deformation of soil is related to the ratio of the width of excavation and the depth of excavation.